When using export persona in AffinityPhoto version 1.7.1.404 (german language setting) using variables for slicename to save have no effect.
See example in Screenshot.
Only "Slice1.jpg" is used in exported image.

Publisher 1.7.0.312
Spread Setup: facing pages
Workflow:
change document size in "Spread Setup/Dimensions" (in my case to smaller)
choose "Object will rescale", in "Scaling"
Apply with OK
Error: all guidlines placed over two facing pages will end up on the left page!
See Screenshot (16).png befor, and Screenshot (1).png after